Test JS script file

Selected file: 051null_comparison.js
Compare console.log() outputs in browser and NodeJS.
Notice: Open browser's console in FireBUG!

  1. 001syntax_unicode.js
  2. 010number_DecToHex.js
  3. 011number_HexToDec.js
  4. 012number_toExponential.js
  5. 013number_modulo.js
  6. 014number_division_by_zero.js
  7. 015number_NaN.js
  8. 016number_infinity.js
  9. 017number_isFinite.js
  10. 018number_isNaN.js
  11. 019number_negative_zero.js
  12. 020number_float_rounding_error.js
  13. 030string_htmlTags.js
  14. 030string_multiline.js
  15. 031string_length.js
  16. 032string_concatenate.js
  17. 032string_concatenate2.js
  18. 033string_minus.js
  19. 035stringmethods_charAt.js
  20. 035stringmethods_concate.js
  21. 035stringmethods_indexOf.js
  22. 035stringmethods_match.js
  23. 035stringmethods_match_memory.js
  24. 035stringmethods_replace.js
  25. 035stringmethods_search.js
  26. 035stringmethods_split.js
  27. 035stringmethods_toString.js
  28. 035stringmethods_toUpperCase.js
  29. 035stringmethods_trim.js
  30. 036string_regexTest.js
  31. 040bool_falsy.js
  32. 040bool_truthy.js
  33. 041bool_comparison.js
  34. 042bool_conditional_operator.js
  35. 043bool_logic_operators.js
  36. 044bool_not_exe_function.js
  37. 050null_typeof.js
  38. 051null_comparison.js
  39. 053undefined_var.js
  40. 054ReferenceError.js
  41. 055global_object_browser.js
  42. 055global_object_node.js
  43. 056global_properties_browser.js
  44. 056global_properties_node.js
  45. 057wrapper_object.js
  46. 058wrapper_object_readonly.js
  47. 60object_reference.js

..:: Source code - 051null_comparison.js ::..

/**
 * comparison of null and empty string
 */

console.log(Boolean('' == null)); //false
console.log(Boolean('' === null)); //false
console.log(Boolean(0 === null)); //false
console.log(Boolean({} === null)); //false
console.log(Boolean({} == null)); //false

console.log('--------------');

var x = null;
if (!x) {
 console.log('x is null');
} else {
 console.log('x is not null');
}
 

..:: NodeJS Console - 051null_comparison.js ::..

$ node 051null_comparison.js 
false
false
false
false
false
--------------
x is null

$ps -aux | grep node (list all node processes)
sasa        1194  0.5  0.5 1304984 84764 ?       Ssl   2025 630:56 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1305000 73504 ?       Ssl   2025 457:29 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.9  0.7 11862204 127344 ?     Ssl   2025 1052:43 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.6 11820060 104904 ?     Ssl   2025 722:02 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.8  0.5 1331116 84380 ?       Ssl   2025 989:17 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.4  0.4 1303640 72096 ?       Ssl   2025 465:37 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1297580 66992 ?       Ssl   2025 456:52 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.1  2.9 12168772 482692 ?     Ssl   2025 4826:38 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  2.7  1.2 11896020 201140 ?     Ssl   2025 3165:57 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.3 1099656 64688 ?       Ssl   2025  75:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1099776 64624 ?       Ssl   2025  75:21 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.3 1099780 65280 ?       Ssl   2025  75:01 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1100008 65224 ?       Ssl   2025  75:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1099524 64580 ?       Ssl   2025  75:06 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.3 1099648 64756 ?       Ssl   2025  74:58 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.4 1102696 67412 ?       Ssl   2025  73:48 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.4 1102688 66548 ?       Ssl   2025  73:36 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.5  0.7 11703940 119096 ?     Ssl   2025 121:33 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1099256 63900 ?       Ssl   2025  74:44 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2628167  0.9  0.8 1176224 132096 ?      Ssl   2025 943:51 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     2766216  0.3  0.3 1099488 64056 ?       Ssl  03:03   4:16 node /home/sasa/dex8/dex8-worker/starter.js
www-data 2857323  0.0  0.0   2608   592 ?        S    23:30   0:00 sh -c ps -aux | grep node
www-data 2857325  0.0  0.0   3304   712 ?        S    23:30   0:00 grep node
sasa     3168557  0.7  0.6 11823444 98480 ?      Ssl   2025 679:11 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798920 83844 ?      Ssl   2025 502:58 node /home/sasa/@mikosoft/dodo-examples/server/index.js